Handling receive packets with limited buffer space

Handling receive packets with limited buffer space

[Amit Uttamchandani]

In my modified ethoc.c driver, I am using only one receive buffer
descriptor due to limited space. This works fairly well for small
packets (arp, pings, etc.).

However, doing a 'wget' and downloading a file causes lots of drops and
thus results in a terminated connection.

How do I go about dealing with this? I tried stopping the queue
(netif_stop_queue) while I'm processing the rx skb and then resuming it
once I'm done, but this did not seem to help.

Any ideas on this?

Thanks for any help.
Amit

Re: Handling receive packets with limited buffer space

[Andi Kleen]

Amit Uttamchandani <amit.uttam@gmail.com> writes:

> In my modified ethoc.c driver, I am using only one receive buffer
> descriptor due to limited space. This works fairly well for small
> packets (arp, pings, etc.).
>
> However, doing a 'wget' and downloading a file causes lots of drops and
> thus results in a terminated connection.
>
> How do I go about dealing with this? I tried stopping the queue
> (netif_stop_queue) while I'm processing the rx skb and then resuming it
> once I'm done, but this did not seem to help.
>
> Any ideas on this?

You'll need to allocate a new skb and copy into it before
passing the data up the stack.

-Andi
-- 
ak@linux.intel.com -- Speaking for myself only.